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A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It corresponds to approximately 5.067 × 10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section. As the definition of the unit contains π, it is easy to calculate area ...
circular inch: circ in ≡ π ⁄ 4 sq in ≈ 5.067 075 × 10 −4 m 2: circular mil; circular thou: circ mil ≡ π ⁄ 4 mil 2: ≈ 5.067 075 × 10 −10 m 2: cord: ≡ 192 bd ≡ 1.486 448 64 m 2: cuerda (PR Survey) cda ≡ 1 cda x 1 cda = 0.971 222 acre ≡ 3 930.395 625 m 2: dunam: ≡ 1000 m 2: ≡ 1000 m 2: guntha (India) ≡ 121 sq yd ...
In the North American electrical industry, conductors thicker than 4/0 AWG are generally identified by the area in thousands of circular mils (kcmil), where 1 kcmil = 0.5067 mm 2. The next wire size thicker than 4/0 has a cross section of 250 kcmil. A circular mil is the area of a wire one mil in diameter. One million circular mils is the area ...
A thousandth of an inch is a derived unit of length in a system of units using inches. Equal to 1000 of an inch, a thousandth is commonly called a thou / ˈθaʊ / (used for both singular and plural) or, particularly in North America, a mil (plural mils). The words are shortened forms of the English and Latin words for "thousand" (mille in Latin).
Circular measure. A circular measure was used in comparing circular cross-sections, e.g., of wires, etc. A circular unit of the ares is the area of the circle whose diameter is one linear unit. [1] For example, 1 circular mil is equivalent to 0.7854 square mil in area, 1 circular millimeter = 1550 circular mils = 0.7854 square millimeter. Here [1]
Thickness of aluminum foil is measured in mils (1 ⁄ 1000 inch, or 0.0254 mm) in the United States. Cross-sectional area of electrical wire is measured in circular mils in the U.S. and Canada, one circular mil (cmil) being equal to 5.067 × 10 −4 mm 2 (or 7.854 × 10 −7 in 2). Since this is so small, actual wire is commonly measured in ...
A square mil is a unit of area, ... 6.4516 × 10 −10 square metres; about 1.273 circular mils (1 circular mil is equal to about 0.7854 square mils).
This formulas can't possibly be right in its current form: "circular mil = square inches × π ÷ 4,000,000". Plugging in 0.7854 millionths of a square inch (as this is the value given in the next section "1 circular mil is approximately equal to: 0.7854 millionths of a square inch (1 square inch is about 1.273 million circular mils)") does not result in 1 cmil!